Umbrella



FIG. 1 is a top perspective view of an umbrella, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof, the right-side elevational view and left-side elevational view both being identical thereto;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a bottom perspective view thereof.

The broken lines shown on the umbrella canopy indicate stitching and form part of the claimed design. 

CLAIM I claim the ornamental design for an umbrella, as shown and described. 